Tatsuya Shimizu [清水達也 Shimizu Tatsuya], more commonly known as Tatsh is a Japanese music composer that is known for his compositions for the beatmania IIDX series. His first Bemani project was in 2004 on beatmania IIDX 10th style. He has worked with various other Bemani artists. Tatsh has since left Bemani to make music for various visual novels. On the 17th of August 2008, Tatsh released his first solo album entitled 'Tatsh Music Collection -I-'.